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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa40a8cec17dcd200b57fa3d48b55d55efded0af2ae8be4ff5712d48d555633' 
  AND token = 'GQzjv91JP6d8h+zqmamFUsHSjkebe1bktn17Wst9Irk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}